Bulinus truncatus

About: Bulinus truncatus is a research topic. Over the lifetime, 414 publications have been published within this topic receiving 5640 citations.

The interactive effect of some molluscicides on the inermediate host of human bilharziasis and their associated zoosporic fungi in the river Nile, Egypt.

Abstract: Biomphalaria alexandrina and Bulinus truncatus are the main vectors of human Bilharziasis in Egypt. The mycotic inhabitants of both control and treated snails were surveyed at 7 and 15 days intervals. The two molluscicides affected more on the mortality of Biomphalaria alexandrina than Bulinus truncatus. The highest population of zoosporic fungi was collected from Biomphalaria alexandrina, the lowest from Bulinus truncatus. Copper sulphate was more effective than Bayluscide on the fungal species of both snails. Achlya, Dictyuchus and Saprolegnia were the common genera while Leptolegnia caudata and Pythium ultimum completely missed from treated snails. The total colonies of zoosporic fungi were lowered after. 15 days of treatment. The two molluscicides inhibited the cell division of both tested snails.

Response of two vector snail species to infectivity with compatible and incompatible Schistosoma parasites

Abstract: Schistosomiasis remains one of the most prevalent parasitic infections and has significant economic and public health losses in many developing countries. Understanding the host/parasite interactions is important, since questions arise concerning the susceptibility of snails to infection by respective trematodes and their specificity and suitability as hosts for continued parasite development. Thus the aim of this research is to extend our knowledge about the biological basis of the snail/parasite relationship with the hope of finding novel ways to disrupt the transmission of this disease. In the current research the compatibility/incompatibility of two types of snails,Biomphalaria alexandrina and Bulinus truncatus with their target and nontarget miracidia (Schistosoma mansoni and Schistosoma haematobium) was investigated histopathologically and also by identifying some host defense mechanisms against the invading parasite by biochemical analyses through the measurement of lipid peroxides, and the antioxidant enzymes glutathione reductase, superoxide dismutase and catalase in these snails. The results showed that the parasites invading the incompatible snail species were immediately recognized by the host hemocytes and encapsulated at an early stage of snail penetration , while those infecting the compatibile snails were well developed as mother sporocysts. The obtained data also demonstrated that lipid peroxides were increased in snails exposed to the noncompatible parasite while the antioxidant enzyme levels were elevated in snails exposed to the compatible parasite indicating the capability of the respective parasites to overcome the defense mechanisms generated by its host. The infection rate between each type of snail and its compatible parasite was higher than with the non-compatible parasite. Results of these experiments strongly support the hypothesis that endogenous expression and regulation of larval antioxidant enzymes serve a direct role in protection against external oxidative stress, including immune-mediated cytotoxic reactions. This may open new areas for investigating new immuno or chemotherapies or vaccines against the enzymes or products that the parasite releases or needs to survive within its host.

Molluscicidal properties of Acacia nilotica subspecies tomentosa and astringens. I

Abstract: The acetone, alcohol and aqueous extracts of the fruits and stem bark of Acacia nilotica subspp. tomentosa, astringens and nilotica showed molluscicidal activity against the two snail species which transmit schistosomiasis in the Sudan. Being effective against Bulinus truncatus and Biomphalaria pfeifferi, extracts of the Acacia nilotica subspecies may be promising vegetable molluscicides.

A longitudinal study of schistosome intermediate host snail populations and their trematode infection in certain areas of Egypt.

Abstract: Seasonal variation of Biomphalaria alexandrina and Bulinus truncatus populations and their infection rates with schistosome and other trematode cercariae were studied longitudinally in four water courses located in Giza and Faiyoum Governorates. Abundance of both species varied from year to year and according to the type of habitat. The mean prevalence of Schistosoma mansoni in Biomphalaria was 0.29%, that of S. haematobium in Bulinus was 1.36%. Seasonal variations of age structure of the 2 vector snails were monitored throughout the survey period. Infection rates with schistosome and other trematodes among Bulinus and Biomphalaria increased with the increase in snail size. Data suggest the occurrence of an antagonistic interaction between schistosome and non-human cercariae, especially echinostome, in infected snails.

Studies on the biology and population parameters of Bulinus globosus and Bulinus truncatus in the laboratory

Abstract: Investigation was made into some aspects of biology and population parameters of Bulinus globosus and Bulinus truncatus which are snails implicated in the transmission of urinary schistosomiasis in Agulu Lake Area of Anambra state, Nigeria. These snails were collected from the lake and reared in the laboratory. From observations, life tables were constructed and some population parameters calculated. The incubation period for the two species was 7-14 days while 21% of the egg was unviable for both species. The highest rate of oviposition by B. globosus was 261.64 ± 59.01 eggs/snail (week 20) while B. truncatus had 241.04 ± 52.87 at week 18. The net reproductive rate (ro), generation time (Tc) and capacity rate of increase (rc) for the two species were similar. Since both species are well adapted and thrive well at different arms of the lake, control of both species will remarkably reduce the infection rate of Schistosoma haematobium in the area. Keywords : Bulinus trucatus, Bulinus globosus , population parameters, control, S. haematobium . Nigerian Journal of Parasitology Vol. 29 (1) 2008 pp. 11-14